Compressed-air engine.



11. 11. MURRAY. 7 GOMPRESSED AIR ENGINE. JPP'LIMTIQN FILED APR. '1,1911.

Patented Sept 5, 1911.

2 SHEETS-SHEET 1.

:.M. 1 my D. H. MURRAY.

COMPRESSED AIR ENGINE.

APPLIOATION r1131) 1211.1, 1911.

Patented Sept. 5, 1911.

2 SHEETS-11153! 2.

Samuel H30 0 ,arifay Zia/9E wilmmm GHQ/anus ways. The cylinder s areadapted to Inoye tons, .or, abutments are thus held from move UNITEDSTATES DICK H.- MURRAY,

PATENT. OFFICE.

OF HOUSTON, TEXAS.

COMPRESSED-AIR ENGINE.

Specification of Letters Patent.

Patented Sept. 5, 1911.

Application filed April 1, 1911'. Serial No. 618,299.

To all whom it may concern:

Be it known that I,D1oK citizen of the United States, residing atHouston, in the county of Harris and State of Texas, have inventednewand useful Improvements in Compressed-Air Engines, of

which the following is a specification.

This invention relates to compressed air engines, and its object is toprovide a duplex-cylinder engine wherein a power impulse maybe obtainedon each half revoluconstruction, combination and arrangement of pa'rts,hereinafter fully described and claimed, reference'being had to theaccompanying drawings, in which 1 Figure 1 is a sectional plan view of acompressed air engine embodying my invention.

Fig. 2 is a section on the line 22 of Fig. 1.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Figs. 4 and 5 are sectional views of the governingv'alve its differentpositipns.

Referring 'to-the drawings, 1 designates a suitable supporting frame,provided with guide ways'3and' 4 for a pair of reciprocat lng parallelcylinders 5 and 6, which are sultably mounted to travel upon the guidein unison in, opposite directions, and each cyllnd'er is closed at oneend and open at its opposite end. Associated with the 'respect1vecylinders are pistons 01'' abutments 7 and 8, each comprising a head 9provided with suitable packing rings, an outwardly extending rod or stem10, and a cross piece 11 at the outer end of said rod or stem bolted orotherwise fixed to the frame.- r lhe pisment while the cylinders have areciprocating motion. In practice, the connectionsbe tween the cylindersand the guide ways are made ball bearing,-so asvto reduce frictionalresistance in the operation of the cylinder.-

Extending transversely beneath the. cyl- 'inders and guide ways is'theengine shaft 12 journaled vat its opposite ends in suitable bearings 13and carrying adjacent each lip-I. MURRAY, 21

- end a fly wheel 14. Mounted on this shaft beneath the cylinders aregear pinions 15 and 16. which mesh with rack bars 17 and 18, on therespective ,cylinders, whereby in the operation of the cylinders motionwill shaft, which will thus be given a power 1mpinions 15 and 16 have asuitable pawl and ratchet or clutch connection with the shaft,

one direction and to be fixed to communicate motion to the shaft whenthey are turned in the reverse direction; It will be their clutchdevices are so arranged as to impart working motion to the sha when whenthe cylinder is on its" inactive orreturn movement.

:wheels 19 whlch mesh withg'ears 20 on a driving shaft 21 journaled insuitable .ball bearings 22 in parallel relation to the engine shaft, andcarrying fly wheels 23. On said shaft 21 is also a ge'aror pulley 24,

from to gearing or machinery to be driven; At one end of the shaft 21 isa gear 25 mesh- .of whichis connectedby a pitman rod 28 with a rod orshaft-29v provided with a: cross 'rod '29 is 'connected'withthe-stem 32of a pump piston 33 operating in a pump cylinderh34, connected by acheck valve ipe 35 with an air reservoir 36, whereby t rough 'theoperation of the gearing just described the pump maybe operated tosupply compressed air to" the tank for use as themedium for, driving themotor cylinders.

gears 20 into and out of mesh with the throwing the gearing 25 into andout of tain conditions the pumps maybe operated to replenish the airtank or reservoir, as in the application of the motorto a vehicle, whenthe vehicle is descending a grade by the force of gravity.

tank 36 to valve casings 38- disposed at a point between .the cylindersis an air feed or supply pipe 39 having a controlling alternately betransmitted thereby tothe pulse oneach half revolution thereof. The

"so as to turn independently of the shaft in.

1 understood, of course, that the-pinions and the associated cylinder ison its-workin movement,'and to turn-freely on the sha t Mounted upon theshaft '12 are gear .whereby power may be transmitted there-.

ihead 30traversing a suitable guide 31.1 The- Clutches 36 may beprovided to throw thegears 19,-and a, clutch 37 is provided for.

mesh with the gear- 26, Hence, under eel-1av Leading from the storagereservoir or ing with'a crank gear 26, the wrist pin 27 "o being.properlycheck valvedto' control the pipes 41 and 42 being connected withone valve casing and the pipes 43 and 44 with the other valve casing at\points opposite the points of communication of the pipe 39 with .saidcasings, each of which latter is provided witha suitably arranged,exhaust' port 45. Arranged within each valve casing is a rotary plugvalve 46 having a passage 47 adapted in one position to connect the feedpipe with the inlet pipe 41 or 43, and in its reverse position toconnect the exhaust port with the exhaust pipe' 42 or 44'.

Each valve has an upwardly projecting stem carrying at its upper end abevel gear wheel 48, which wheels. mesh with the beveled toothed portionof an intermediate gear wheel 4 ,whichis also provided with spur geartee h meshing withrack bars 50fand 51, connected with the respectivecylinders 5 and6, so that in thebperation of the cylinders inotion willbe transmitted :tothe valves 46 to efl'ect the feed of fluid pressure toand its exhaust from the cylinders. The

valves move in opposite directions to each other to their .respectivefeed and exhaust. positions, so that when one valve is in position toallow fluid'pressure topass to one cylinder the other valve will-be inexhaust position, and vice versa. The pipes 41 and 42 have portionsarranged parallel with the g stem of the piston 7 and suitably connectedtherewith, and have their adjacent ends passing through the head 9of'said piston and communicatingwith the cylinder 5, the

' pipes 43 and 44 being similarlyarranged with respect to thepiston- 8ofthe cylinder 6. By this construction the inlet. pipe associated witheach cylinder isada ted to the liead .of the piston associated with thesaid cylinder to impel the cylinder on, its working stroke,

.' to permit exhaust of the-fluid pressuresfrom' the cylirider throughthe-piston head on the return movefnentofsa id cylinder, said pipes flowof fluid ressure as shown.

.4 It will thus be seen that the invention provides a compressed airmotor whereby pressure supply, an engine shaft, a pair of.

stationary pistons, a pair of oppositely reciprocating cylinderscooperating therewith, gearing for imparting motion from the cylindersto the engine shaft on the working strdkes of said cylinders, a drivingshaft in gear with the engine shaft, a pair of valvecasings eachprovided with a feed ort and anexhaust port, said feed ports eingincommunication with said source of fluid pressure supply, fluid feedand exhaustports" leading from each casingto' the associated cylinder, arotary valve in each valve casing movable in opposite directions toconnect the feed port and feed pipe and the exhaust port and exhaustpipe, respectively, "said valves being movable in opposite directionsfor correspondin tions, lgears connected with the valves, a shaftcarrying gears, one meshing with the valve gears,',and rack teeth on.the pistons meshing with the other gear upon said shaft for alternatelyimparting reverse movements to the valves ion the opposite movementsofthe cylinders;

2. An engine comprising a source of fluid pressure su ply, an engineshaft, means op- ;erat edby md pressure from said source of supply todrive said shaft, a driving shaft .in gear with the engine shaft, meansfor throwing'the connecting gearing into and out of action, a pumphaving a delivery controlling ac- 'connection'communicating with thesource JOHN F. PERRY,

O. B. WHITE.

piston, crank

